Automatic interrupter for electric heating apparatus



Afar 1 1924. 1,489,103

. R. ANDERSSON AUTOMATIC INTERRUPTER FOR ELECTRIC HEATING APPARATUSFiled Nov. 13 1922 a citizen of the Kin BEST J ll? Patented Apr. 1,1924.

UNITED, STATES- new Burner mnmtssou,

OF SKAR'BLAC'KA, SWEDEN.

1 AUTOMATIC'INTEBRUPTEB FOR ELECTRIC HEATING APPARATUS.

Appltcatlon filed November 13, 1922. Serial No. 600,662.

To all whom it Be it known may concern. that I, RUPERT Aunrmssox,

' dom of Sweden, residweden, have invent new and useful Improvements inAutomatic Interrupters for Electric Heating Apparatus, of which thefollowing is a specification.

This invention terrupters for electric such as electric irons, similarapparatus.

The ob ect of the invention is to provide a simple and reliableinterrupter of the said kind which will automatically open the circuitof the heating apparatus as soon as the heater reaches a predeterminedtemperature. According to this invention the interrupter comprises atubular member to be put directly on a contact pin of the heatingapparatus so as to be heated by heat transmission therefrom, slidablymounted on said tubular member and normally secured in place thereon bymeans of a metal or alloy havin a low melting point, said sleeve havinga arm adapted to engage a rigid forlr-shaped contact member, when thesleeve is in normal position on the tube, while being disengagedtherefrom, when after reaching the predetermined temperature the metalor alloy is melted thereby releasin the sleeve, and the latter isthereupon disp aced on the tube due to the action of a spring or its ownweight.

ing at Skarblacka,

relates to automatic inheating apparatus, electric stoves and laterallyprojectin contac In the accompanying drawing one em- 1 bodiment of theinvention is illustrated. Figs. 1 and 2 are two longitudinal sections ofthe interrupter at right angles to each other. Fig. 3 is a longitudinalsection of a cartridge fuse for use in connection with the interruptershown in Figs. 1 and 2. Fig. 1 is a cross section on line A A, Fig. 1.

With reference to the drawing, the numeral 1 indicates a block ofinsulating material, said block having three openings 2, 3, 4 formed init, the openings 3 and 4; communicating with each other through alongitudinally extending slot 5. Inserted in the opening 2 is a contactsleeve 6 adapted to be putdirect'ly on one contact in of a heatingapparatus (not shown). Attached to the sleeve 6 is one leading-in wire7. The opening 3 contains a orkd contact member 8 to which the other atone cut t 14 may be controlled manually by leading-in wire 9 isconnected. The opening 4 is adapted to receive a cartridge fuse moreclearly shown in Fig.

The said cartridge fuse comprises an inner tube10 adapted to be put onthe other contact pin of the heating apparatus, and an outer tube orsleeve 11 the length of which'is less than that of the tube 10. Thesleeve 11 is capable of moving longitudinally on the tube 10 and carriesa laterally pro- 1ect1ng arm 12 adapted to engage the forkshapedcontact'8 above referred to. vided outside the tube 10 at the endsthereof are annular stops 13 to limit the longitudinal movement of thesleeve 11 relatively to the tube 10. \Vith the sleevell abutting againstone of the stops 13 a soft brass alloy, such as \Voods alloy, is pouredin between tube 10 and sleeve 11 which will thereby be secured in placerelatively to each other.

Inserted in a reduced extension of the. opening 1 at the bottom thereofis a flexible holding member 14 adapted to engage any of two notches 15formed inside the tube 10 near the ends thereof. The holding membermeans of a button 16. The opening 4 18 also adapted to receive a helicalpring 17 of an inside diameter corresponding to the outside diameter ofthe sleeve 11.

The cartridge fuse, described above, is inserted into the opening 1 withthat end first at which the sleeve 11 is positioned and with the arm 12engaging the slot 5. The cartridge is moved inwardly while com- )ressingthe spring till the arm 12' engages the fork 8 and the holding member 11 engages the respective notch 15 and locks the cartridge in position.

A metallic connection will now exist from the leading-in wire 9 throughfork 8, arm 12, sleeve 11, and to the tube 10 by way of the alloyconnecting the sleeve 11 to the tube 10.

The interrupter, when put on the'contact 1 pins of the heatingapparatus, will thus close the circuit thereof. Then the temperature otthe heating apparatus and thus also that of the cartridge fuse hasreached its predetermined maximum value which is dependent on themelting point. of the alloy used to secure sleeve 11 to tube 10, thisalloy will melt thereby releasing the 11 from the tube 10. Thecompressed sprin' 17 is now free to displace the sleeve 11/ Prosleevethe tube 10 outwardly till the outer end of the sleeve engages the outerstop 13 of the tube 10 and is stopped thereby. In this movement the arm12 is released from the fork 8 thereby opening the circuit of theheating apparatus. The melted alloy accompanies sleeve. 11 in the abovesaid movement and hardening immediately upon the reduction oftemperature will again bind sleeve 11 to tube 10 in the relativeposition in which the sleeve is at the outer end of the tube.

To again close the circuit of the heating apparatus the cartridge fuseshould be removed from the opening 4 which may be effected by applyingpressure to the button 16 which will then cause the holding member 14 torelease the tube 10. The cartridge when cooled, may then be removed andturned to be again inserted in the opposite direction thereby againclosing the circuit in the same way as that previously described.

It should be noted, that the interrupter described may be used invertical and horizontal position as well as in any inclined positionbetween vertical and horizontal.

Instead of thes pring 17 to effect the displacement of the sleeve 11,when released, use may be made of the own weight of the sleeve for thesame purpose. In such case, however, the interrupter cannot, of course,be used in any position.

1. An automatic interrupter for electric heating apparatus, comprisingin combination an insulating base portion, a fixed contact sleevecarried by said base portion and connected to a currentwire, anotherfixed contact member carried by said base portion and connected toanother current wire, a tube, to be loosely inserted in said baseportion. a sleeve slidably mounted On said tube and secured in placethereon by means of a soldering material having a. low melting point,and a contact member on said sleeve adapted to engage said other fixedcontact member and to be automatically moved out of engagementtherewith, as soon as the soldering material melts.

2. An automatic interrupter for electric heating apparatus, comprising'in combination an insulating base portion, a fixed contact sleevecarried by said base portion and connected to a cunent wire, anotherfixed contact member carried by said base portion and connected toanother current wire, a tube, to be loosely inserted in said baseportion, a sleeve slidably mounted on said tube and secured in placethereon by means of a soldering material having a low melting point, anda contact member on said sleeve adapted to engage said other fixedcontact member and means for automatically moving said last mentionedsleeve on said tube, as soon as the soldering metal melts, to therebybring the contact member thereof out of engagement with thecorresponding fixed contact member.

In testimony whereof I have signed my name.

RUPERT ANDERSSON.

